31161216113 has 4 divisors (see below), whose sum is σ = 31260773028. Its totient is φ = 31061659200.

The previous prime is 31161216077. The next prime is 31161216127.

It is a happy number.

31161216113 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1007935504 + 30153280609 = 31748^2 + 173647^2 .

It is a cyclic number.

It is not a de Polignac number, because 31161216113 - 2¹⁶ = 31161150577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31161216013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49777988 + ... + 49778613.

It is an arithmetic number, because the mean of its divisors is an integer number (7815193257).

Almost surely, 2^31161216113 is an apocalyptic number.

It is an amenable number.

31161216113 is a deficient number, since it is larger than the sum of its proper divisors (99556915).

31161216113 is an equidigital number, since it uses as much as digits as its factorization.

31161216113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99556914.

The product of its digits is 648, while the sum is 26.

The spelling of 31161216113 in words is "thirty-one billion, one hundred sixty-one million, two hundred sixteen thousand, one hundred thirteen".